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289 

WWUS20 KWNS 082252

SEL4

SPC WW 082252

ARZ000-OKZ000-090700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 274

NWS STORM PREDICTION CENTER NORMAN OK

555 PM CDT FRI MAY 8 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN AND CENTRAL ARKANSAS

       SOUTHERN AND EASTERN OKLAHOMA



EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY MORNING FROM 555 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 35 MILES EAST OF BATESVILLE

ARKANSAS TO 50 MILES SOUTH OF CHICKASHA OKLAHOMA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU4).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS.



OTHER WATCH INFORMATION...CONTINUE...WW 268...WW 270...WW

271...WW 272...WW 273...



DISCUSSION...TSTMS EXPECTED TO INCREASE/DEVELOP ALONG SLOWLY-MOVING

BOUNDARY ARCING FROM S CNTRL OK TO N CNTRL AR.  AMPLE DEEP

SHEAR/INSTABILITY PRESENT FOR SUPERCELLS WITH VERY LARGE HAIL/DMGG

WIND AND POSSIBLE TORNADOES GIVEN RICH QUALITY OF BOUNDARY LAYER

MOISTURE.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 27025.





...CORFIDI

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